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Testnet
A parallel blockchain used for testing smart contracts and applications without risking real funds.
Last Updated
2026-03-29
Related Concepts
What is Testnet?
A testnet is a separate blockchain that mirrors the mainnet but uses worthless test tokens. Developers use it to experiment with smart contracts and DApps without any financial risk.
How does Testnet work?
- Developers configure their wallet and tools to point to a testnet RPC endpoint.
- Free test tokens are obtained from faucets websites that distribute them automatically.
- Contracts are deployed and tested with identical rules to mainnet.
- Once confident, developers deploy to mainnet.
Why does Testnet matter?
A contract bug on mainnet can drain real funds instantly and irreversibly. Testnets eliminate that risk during development.
Key features of Testnet
- Free test tokens available via faucets
- Identical rules and mechanics to mainnet
- Isolated from mainnet can be reset without consequences
- Most chains maintain multiple testnets for different development phases
Examples of Testnet
Ethereum's Sepolia is the current primary testnet for contract development. Polygon's Mumbai testnet is used before mainnet deployment.
Aave tests governance proposals on testnet before executing on mainnet.